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                [Poi2010]Bridges                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：259MB</p>			</div>
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                                <h3>题目描述</h3><p><p>YYD为了减肥，他来到了瘦海，这是一个巨大的海，海中有n个小岛，小岛之间有m座桥连接，两个小岛之间不会有两座桥，并且从一个小岛可以到另外任意一个小岛。现在YYD想骑单车从小岛1出发，骑过每一座桥，到达每一个小岛，然后回到小岛1。霸中同学为了让YYD减肥成功，召唤了大风，由于是海上，风变得十分大，经过每一座桥都有不可避免的风阻碍YYD，YYD十分ddt，于是用泡芙贿赂了你，希望你能帮他找出一条承受的最大风力最小的路线。</p></p><hr/><h3>输入格式</h3><p><p>输入：第一行为两个用空格隔开的整数n（2&lt;=n&lt;=1000），m(1&lt;=m&lt;=2000)，接下来读入m行由空格隔开的4个整数a，b（1&lt;=a,b&lt;=n,a&lt;&gt;b），c，d(1&lt;=c,d&lt;=1000)，表示第i+1行第i座桥连接小岛a和b，从a到b承受的风力为c，从b到a承受的风力为d。</p></p><hr/><h3>输出格式</h3><p><p>输出：如果无法完成减肥计划，则输出NIE，否则第一行输出承受风力的最大值（要使它最小)</p></p><hr/><h3>样例输入</h3><pre>4 4
1 2 2 4
2 3 3 4
3 4 4 4
4 1 5 4
<img border="0" src="../file/2095_0.jpg"></pre><hr/><h3>样例输出</h3><pre>4
</pre><hr/><h3>提示</h3><p><p>注意：通过桥为欧拉回路</p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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